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quantifying the variability of the annular modes

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What Makes an Annular Mode Annular? Journal of the

Jan 12,2017 quantifying the variability of the annular modes#0183;Wavenumber-0 (i.e.,annular mode) variability emerges as the leading predicted EOF of the flow at virtually all latitudes but explains a much larger fraction of the variance of the flow in the tropics and the polar regions than it does in middle latitudes,where wavenumbers 0,1,2,and 3 are of nearly equal importance.Wave-maintained Annular Modes of Climate Variabilityannular modes of variability in either hemisphere.In this paper,we extend the work of LH in docu-menting the structure and dynamical maintenance of annular modes,using observations and a realis-tic general circulation model (GCM).The analyzed results suggest that momentum forcing by eddy uxes sustains the annular wind,temperature andWave-maintained Annular Modes of Climate Variabilityannular modes of variability in either hemisphere.In this paper,we extend the work of LH in docu-menting the structure and dynamical maintenance of annular modes,using observations and a realis-tic general circulation model (GCM).The analyzed results suggest that momentum forcing by eddy uxes sustains the annular wind,temperature and

Wave-Maintained Annular Modes of Climate Variability

sustain the annular modes of variability in either hemi-sphere.However,these modes may be sensitive to ex-ternal forces due,for example,to ozone depletion and/ or global warming (Hartmann et al.2000; and references therein).In this paper,we extend the work of LH in docu-menting the structure and dynamical maintenance of annular modes.Testing the Annular Mode Autocorrelation Time Scale in variability is introduced in the context of Held and Suarezs 1994 proposal for comparing the dynamics of different general circulation models.A simple procedure to compute ,the e-folding time scale of the annular mode autocorrelation function,is presented.This quantity concisely quantifies the strength ofTesting the Annular Mode Autocorrelation Time Scale in variability is introduced in the context of Held and Suarezs 1994 proposal for comparing the dynamics of different general circulation models.A simple procedure to compute ,the e-folding time scale of the annular mode autocorrelation function,is presented.This quantity concisely quantifies the strength of

Stratospheric variability and tropospheric annularmode

Oct 29,2011 quantifying the variability of the annular modes#0183;1.Introduction [2] The annular modes (AM's) are the dominant modes of variability in the extratropical circulation in both the troposphere and stratosphere [e.g.,Thompson and Wallace,2000; Kushner,2010].They are also the preferred response of the extratropical circulation to many different climate forcings.Indeed,the predicted circulation response to climate change projects Stratospheric variability and tropospheric annularmode Oct 29,2011 quantifying the variability of the annular modes#0183;1.Introduction [2] The annular modes (AM's) are the dominant modes of variability in the extratropical circulation in both the troposphere and stratosphere [e.g.,Thompson and Wallace,2000; Kushner,2010].They are also the preferred response of the extratropical circulation to many different climate forcings.Indeed,the predicted circulation response to climate change projects Southern Annular Mode Dynamics in Observations andvariability in the Southern Hemisphere (SH) midlat-itudes,particularly in the summer season.The southern annular mode (SAM) is the dominant mode of variability in the SH tropospheric midlatitude circulation (Kidson 1988; Thompson and Wallace 2000) and

Quantifying the variability of the annular modes

The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the position of the tropospheric jet streams and the strength of the stratospheric polar vortices.Their representation in all available reanalysis products is assessed.Quantifying the variability of the annular modes Quantifying the variability of the annular modes Reanalysis uncertainty versus sampling uncertainty Edwin P.Gerber1 and Patrick Martineau2 1Courant Institute of Mathematical Sciences,New York University,251 Mercer Street,New York NY 10012,USA 2Research Center for Advanced Science and Technology,University of Tokyo,Japan Correspondence Edwin P.Gerber ([email protected])Quantifying the variability of the annular modes quantifying the variability of the annular modes#0183;The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the position of the tropospheric jet streams and the strength of the stratospheric polar vortices.Their representation in all available reanalysis products is assessed.Reanalysis uncertainty associated with limitations in the ability to constrain the

Quantifying the variability of the annular modes

Abstract The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the position of the tropospheric jet streams and theQuantifying the uncertainty of the annular mode timeQuantifying the uncertainty of the annular mode time scale and the role of the stratosphere Junsu Kim1,2 Thomas Reichler1 scale of major modes of extratropical variability in the atmosphere,also known as the annular modes (Thomp- Quantifying the uncertainty of the annular mode time scale and the role of the stratosphere 639 1 3Quantifying the uncertainty of the annular mode time scale The proper simulation of the annular mode time scale may be regarded as an important benchmark for climate models.Previous research demonstrated that this time scale is systematically overestimated by climate models.As suggested by the fluctuationdissipation theorem,this may imply that climate models are overly sensitive to external forcings.

Quantifying the eddy-jet feedback strength of the

60 Quantifying the strength of eddy-jet feedback is important for understanding both internal vari- 61 ability and response to external forcing.One common issue with the current GCMs is that the 62 simulated annular mode is too persistent compared to observations (Gerber et al.2008a),which 63 not only indicates biases of jet variability,but also suggests overestimation of changes in theQuantifying the annular mode dynamics in an idealized barotropic annular mode (EOF1 of u) and the baroclinic annular mode.In this study,we focus on the former and simply refer to it as annular mode.Annular modes also robustly emerge as the leading pat-tern of variability in a broad hierarchy of models,from stochastically forced barotropic models toQuantifying the annular mode dynamics in an idealized barotropic annular mode (EOF1 of u) and the baroclinic annular mode.In this study,we focus on the former and simply refer to it as annular mode.Annular modes also robustly emerge as the leading pat-tern of variability in a broad hierarchy of models,from stochastically forced barotropic models to

Quantifying the agreement between observed and

Jul 27,2018 quantifying the variability of the annular modes#0183;As discussed above,an observed mode of variability may be compromised and/or spread across multiple modes in model EOF space.This can be especially problematic if the modes are not well separated,either in observations or models.The CBF method allows us to compare models and observations using a consistent diagnostic framework.Quantifying the EddyJet Feedback Strength of theStrength of the Annular Mode in an Idealized GCM and Reanalysis Data The Harvard community has made this article openly available.Please share how this access benefits you.Your story matters Citation Ma,Ding,Pedram Hassanzadeh,and Zhiming Kuang.2017.Quantifying the EddyJet Feedback Strength of the Annular Mode inQuantifying the EddyJet Feedback Strength of theStrength of the Annular Mode in an Idealized GCM and Reanalysis Data The Harvard community has made this article openly available.Please share how this access benefits you.Your story matters Citation Ma,Ding,Pedram Hassanzadeh,and Zhiming Kuang.2017.Quantifying the EddyJet Feedback Strength of the Annular Mode in

Quantifying the EddyJet Feedback Strength of the Annular

Quantifying the strength of eddyjet feedback is important for understanding both internal variability and response to external forcing.One common issue with the current GCMs is that the simulated annular mode is too persistent compared to observations (Gerber et al.2008a),which not only indicates biases of jet variability but also suggests overestimation of changes in the extratropical Previous123456NextBaroclinic and Barotropic Annular Modes of Variability quantifying the variability of the annular modes#0183;Email [email protected] Modes of variability are climatological features that have global effects on regional climate and weather.They are identified through spatial structures and the timeseries associated with them (so-called EOF/PC analysis,which finds the largest variability of a given atmospheric field).Examples of modes of variability include El Ni quantifying the variability of the annular modes#241;o Southern Oscillation Nonlinear features of Northern Annular Mode variability May 01,2016 quantifying the variability of the annular modes#0183;1.Introduction.The North Atlantic Oscillation (NAO)/ Arctic Oscillation (AO) is the dominant pattern of climate variability affecting North Atlantic region and western Europe .The pattern mentioned above also has been taken as the near-surface Northern Annular Mode (NAM) ,,,since NAM has been defined separately at each isobaric level from Earths surface through the stratosphere .

Nonlinear features of Northern Annular Mode variability

May 01,2016 quantifying the variability of the annular modes#0183;1.Introduction.The North Atlantic Oscillation (NAO)/ Arctic Oscillation (AO) is the dominant pattern of climate variability affecting North Atlantic region and western Europe .The pattern mentioned above also has been taken as the near-surface Northern Annular Mode (NAM) ,,,since NAM has been defined separately at each isobaric level from Earths surface through the stratosphere .JAS Quantifying the Annular Mode Dynamics in anMay 09,2019 quantifying the variability of the annular modes#0183;Pedram Hassanzadeh and Zhiming Kuang.J.Atmos.Sci.76 (2019) 1107-1124.DOI 10.1175/JAS-D-18-0268.1 Abstract.The linear response function (LRF) of an idealized GCM,the dry dynamical core with HeldSuarez physics,is used to accurately compute how eddy momentum and heat fluxes change in response to the zonal wind and temperature anomalies of the annular mode at theEddies and the annular modes of climate variability 1Eddies and the annular modes of climate variability 1 Varavut Limpasuvan and Dennis L.Hartmann Department of Atmospheric Sciences,University of Washington,Seattle,Washington Abstract.The dominant modes of month-to-month varia-tion in the troposphere are realistically simulated in a gen-eral circulation model whose lower boundary is prescribed

Cited by 14Publish Year 2018Author Edwin P.Gerber,Patrick MartineauWhat Makes an Annular Mode Annular? Journal of the

Jan 12,2017 quantifying the variability of the annular modes#0183;Wavenumber-0 (i.e.,annular mode) variability emerges as the leading predicted EOF of the flow at virtually all latitudes but explains a much larger fraction of the variance of the flow in the tropics and the polar regions than it does in middle latitudes,where wavenumbers 0,1,2,and 3 are of nearly equal importance.Cited by 14Publish Year 2018Author Edwin P.Gerber,Patrick MartineauQuantifying the variability of the annular modes Quantifying the variability of the annular modes Reanalysis uncertainty vs.sampling uncertainty Edwin P.Gerber1 and Patrick Martineau2 1Courant Institute of Mathematical Sciences,New York University,251 Mercer Street,New York NY 10012,USA 2Research Center for Advanced Science and Technology,University of Tokyo,Japan Correspondence Edwin P.Gerber ([email protected])Cited by 14Publish Year 2018Author Edwin P.Gerber,Patrick MartineauQuantifying the variability of the annular modes 17100 E.P.Gerber and P.Martineau The annular modes in reanalyses (Gerber and Thompson,2017).The temporal variability of the annular modes provides a convenient means to quantify coupling between tropospheric jets and the stratospheric vor-tices,as well as variations in the amplitude and persistence of the variability through the annual cycle.

Baroclinic and Barotropic Annular Modes of Variability

quantifying the variability of the annular modes#0183;Email [email protected] Modes of variability are climatological features that have global effects on regional climate and weather.They are identified through spatial structures and the timeseries associated with them (so-called EOF/PC analysis,which finds the largest variability of a given atmospheric field).Examples of modes of variability include El Ni quantifying the variability of the annular modes#241;o Southern Oscillation Annular modes and apparent eddy feedbacks in theApr 11,2016 quantifying the variability of the annular modes#0183;Edwin P.Gerber,Patrick Martineau,Quantifying the variability of the annular modes reanalysis uncertainty vs.sampling uncertainty,Atmospheric Chemistry and Physics,10.5194/acp-18-17099-2018,18,23,(17099-17117),(2018).Abstract Quantifying the Dynamics of the Annular Modes The annular modes in both hemispheres are dominant modes of variability in the extratropical circulation.Temporal persistence is a key feature of annular modes in the observed and modeled atmospheres and it has been suggested that a positive feedback between anomalous zonal flow and eddy fluxes is responsible for this persistence.

ACP - Quantifying the variability of the annular modes

Abstract.The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the position of the tropospheric jet streams and the strength of the stratospheric polar vortices.Their representation in all available reanalysis products is assessed.Reanalysis uncertainty quantifying the variability of the annular modeslt;/i quantifying the variability of the annular modesgt; associated with limitations in the ability to 12345NextAnnular Modes - IntroductionThe annular modes are coupled with annular variability in the stratospheric flow during the winter season in the Northern Hemisphere and the spring season in the Southern Hemisphere.For decades,the prevailing wisdom was that stratospheric processes respond to but do not impact the tropospheric flow.But recent observations and model results (PDF) Quantifying the variability of the annular modes PDF The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the Find,read and cite all the research you

(PDF) Annular Modes and Apparent Eddy Feedbacks in the

The annular modes characterize the dominant variability of the extratropical circulation in each hemisphere,quantifying vacillations in the position of the tropospheric jet streams and the

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